What is the derivative of f(x) = 9x^2 + 8x + -5?
- A. 18x^1
- B. 18x + 8 ✓
- C. 18x^2 + 8
- D. 9x^1 + 8
Correct answer
B. 18x + 8
Explanation
Using the power rule, the derivative of 9x^2 is 18x^1, the derivative of 8x is 8, and the derivative of the constant -5 is 0. So f'(x) = 18x + 8.